diff --git a/c/c.go b/c/c.go
index fb70ad1a..6db9e572 100644
--- a/c/c.go
+++ b/c/c.go
@@ -66,7 +66,7 @@ func Memset(s Pointer, c Int, n uintptr) Pointer
 
 // -----------------------------------------------------------------------------
 
-//go:linkname GoStringData github.com/goplus/llgo/internal/runtime.StringData
+//go:linkname GoStringData llgo.stringData
 func GoStringData(string) *Char
 
 // -----------------------------------------------------------------------------
diff --git a/cl/_testdata/print/out.ll b/cl/_testdata/print/out.ll
index 73ea91b5..95380128 100644
--- a/cl/_testdata/print/out.ll
+++ b/cl/_testdata/print/out.ll
@@ -311,7 +311,7 @@ _llgo_0:
 _llgo_1:                                          ; preds = %_llgo_3
   %2 = urem i64 %14, 16
   %3 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @5, i64 16)
-  %4 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %3)
+  %4 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %3, 0
   %5 = getelementptr inbounds i8, ptr %4, i64 %2
   %6 = load i8, ptr %5, align 1
   %7 = getelementptr inbounds i8, ptr %1, i64 %15
@@ -601,8 +601,6 @@ declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llg
 
 declare %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr, i64, i64, i64, i64, i64)
 
-declare ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String")
-
 declare { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
 
 declare { float, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Float32"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
diff --git a/cl/_testrt/allocstr/out.ll b/cl/_testrt/allocstr/out.ll
index c800e619..5726edc7 100644
--- a/cl/_testrt/allocstr/out.ll
+++ b/cl/_testrt/allocstr/out.ll
@@ -34,7 +34,7 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
   %2 = call %"github.com/goplus/llgo/internal/runtime.String" @main.hello()
-  %3 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %2)
+  %3 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %2, 1
   %4 = add i64 %3, 1
   %5 = alloca i8, i64 %4, align 1
   %6 = call ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr %5, %"github.com/goplus/llgo/internal/runtime.String" %2)
@@ -46,8 +46,6 @@ declare %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/ll
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
-declare i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String")
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr, %"github.com/goplus/llgo/internal/runtime.String")
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/builtin/out.ll b/cl/_testrt/builtin/out.ll
index 85393f13..9201f246 100644
--- a/cl/_testrt/builtin/out.ll
+++ b/cl/_testrt/builtin/out.ll
@@ -131,14 +131,14 @@ _llgo_0:
   %60 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @0, i64 5)
   call void @main.string_len(%"github.com/goplus/llgo/internal/runtime.String" %60)
   %61 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @1, i64 5)
-  %62 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %61)
+  %62 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %61, 1
   %63 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewStringSlice"(%"github.com/goplus/llgo/internal/runtime.String" %61, i64 1, i64 %62)
   call void @main.string_len(%"github.com/goplus/llgo/internal/runtime.String" %63)
   %64 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @2, i64 5)
   %65 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewStringSlice"(%"github.com/goplus/llgo/internal/runtime.String" %64, i64 1, i64 2)
   call void @main.string_len(%"github.com/goplus/llgo/internal/runtime.String" %65)
   %66 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @3, i64 5)
-  %67 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %66)
+  %67 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %66, 1
   %68 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewStringSlice"(%"github.com/goplus/llgo/internal/runtime.String" %66, i64 5, i64 %67)
   call void @main.string_len(%"github.com/goplus/llgo/internal/runtime.String" %68)
   ret void
@@ -152,7 +152,7 @@ _llgo_0:
 
 define void @main.string_len(%"github.com/goplus/llgo/internal/runtime.String" %0) {
 _llgo_0:
-  %1 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %0)
+  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %0, 1
   call void @main.out(i64 %1)
   ret void
 }
@@ -171,8 +171,6 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.SliceData"(%"github.com/go
 
 declare %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr, i64)
 
-declare i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String")
-
 declare %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewStringSlice"(%"github.com/goplus/llgo/internal/runtime.String", i64, i64)
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/concat/out.ll b/cl/_testrt/concat/out.ll
index d343c4e2..e775ef4f 100644
--- a/cl/_testrt/concat/out.ll
+++ b/cl/_testrt/concat/out.ll
@@ -81,7 +81,7 @@ _llgo_0:
   %9 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %2, i64 16, i64 3, i64 0, i64 3, i64 3)
   %10 = call %"github.com/goplus/llgo/internal/runtime.String" @main.concat(%"github.com/goplus/llgo/internal/runtime.Slice" %9)
   %11 = load ptr, ptr @__stderrp, align 8
-  %12 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %10)
+  %12 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %10, 1
   %13 = add i64 %12, 1
   %14 = alloca i8, i64 %13, align 1
   %15 = call ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr %14, %"github.com/goplus/llgo/internal/runtime.String" %10)
@@ -103,8 +103,6 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
 declare %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr, i64, i64, i64, i64, i64)
 
-declare i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String")
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr, %"github.com/goplus/llgo/internal/runtime.String")
 
 declare i32 @fprintf(ptr, ptr, ...)
diff --git a/cl/_testrt/index/out.ll b/cl/_testrt/index/out.ll
index b049b8ae..a9af0027 100644
--- a/cl/_testrt/index/out.ll
+++ b/cl/_testrt/index/out.ll
@@ -119,12 +119,12 @@ _llgo_0:
   %61 = load i64, ptr %60, align 4
   %62 = call i32 (ptr, ...) @printf(ptr @3, i64 %61)
   %63 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @5, i64 6)
-  %64 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %63)
+  %64 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %63, 0
   %65 = getelementptr inbounds i8, ptr %64, i64 2
   %66 = load i8, ptr %65, align 1
   %67 = call i32 (ptr, ...) @printf(ptr @4, i8 %66)
   %68 = call %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr @7, i64 6)
-  %69 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %68)
+  %69 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %68, 0
   %70 = getelementptr inbounds i8, ptr %69, i64 1
   %71 = load i8, ptr %70, align 1
   %72 = call i32 (ptr, ...) @printf(ptr @6, i8 %71)
@@ -138,5 +138,3 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.Zeroinit"(ptr, i64)
 declare i32 @printf(ptr, ...)
 
 declare %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewString"(ptr, i64)
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String")
diff --git a/cl/cltest/cltest.go b/cl/cltest/cltest.go
index 436b272e..3b8c60b2 100644
--- a/cl/cltest/cltest.go
+++ b/cl/cltest/cltest.go
@@ -160,7 +160,7 @@ func TestCompileEx(t *testing.T, src any, fname, expected string) {
 		t.Fatal("cl.NewPackage failed:", err)
 	}
 
-	if prog.NeedPyInit() { // call PyInit if needed
+	if prog.NeedPyInit { // call PyInit if needed
 		ret.PyInit()
 	}
 
diff --git a/cl/compile.go b/cl/compile.go
index 62bdb0cb..3d79c4ac 100644
--- a/cl/compile.go
+++ b/cl/compile.go
@@ -309,6 +309,8 @@ func (p *context) funcOf(fn *ssa.Function) (aFn llssa.Function, pyFn llssa.PyFun
 			ftype = llgoAlloca
 		case "allocaCStr":
 			ftype = llgoAllocaCStr
+		case "stringData":
+			ftype = llgoStringData
 		case "unreachable":
 			ftype = llgoUnreachable
 		case "bitCastTo64F":
@@ -479,6 +481,15 @@ func (p *context) allocaCStr(b llssa.Builder, args []ssa.Value) (ret llssa.Expr)
 	panic("allocaCStr(s string): invalid arguments")
 }
 
+// func stringData(s string) *int8
+func (p *context) stringData(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
+	if len(args) == 1 {
+		s := p.compileValue(b, args[0])
+		return b.StringData(s)
+	}
+	panic("stringData(s string): invalid arguments")
+}
+
 func isPhi(i ssa.Instruction) bool {
 	_, ok := i.(*ssa.Phi)
 	return ok
@@ -573,6 +584,8 @@ func (p *context) compileInstrOrValue(b llssa.Builder, iv instrOrValue, asValue
 				ret = p.alloca(b, args)
 			case llgoAllocaCStr:
 				ret = p.allocaCStr(b, args)
+			case llgoStringData:
+				ret = p.stringData(b, args)
 			case llgoUnreachable: // func unreachable()
 				b.Unreachable()
 			case llgoBitCastTo32F:
diff --git a/cl/import.go b/cl/import.go
index 1ed645ab..98c32ef6 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -319,6 +319,7 @@ const (
 	llgoIndex        = llgoInstrBase + 5
 	llgoBitCastTo32F = llgoInstrBase + 6
 	llgoBitCastTo64F = llgoInstrBase + 7
+	llgoStringData   = llgoInstrBase + 8
 )
 
 func (p *context) funcName(fn *ssa.Function, ignore bool) (*types.Package, string, int) {
diff --git a/internal/build/build.go b/internal/build/build.go
index 898ea1c7..5a834bc7 100644
--- a/internal/build/build.go
+++ b/internal/build/build.go
@@ -217,7 +217,7 @@ func buildAllPkgs(prog llssa.Program, initial []*packages.Package, mode Mode, ve
 			}
 		default:
 			buildPkg(prog, aPkg, mode, verbose)
-			setNeedRuntimeOrPyInit(pkg, prog.NeedRuntime(), prog.NeedPyInit())
+			setNeedRuntimeOrPyInit(pkg, prog.NeedRuntime, prog.NeedPyInit)
 		}
 	}
 	return
diff --git a/internal/llgen/llgen.go b/internal/llgen/llgen.go
index 801a81f0..62278f19 100644
--- a/internal/llgen/llgen.go
+++ b/internal/llgen/llgen.go
@@ -79,7 +79,7 @@ func Gen(pkgPath, inFile string, src any) string {
 	ret, err := cl.NewPackage(prog, ssaPkg, files)
 	check(err)
 
-	if prog.NeedPyInit() { // call PyInit if needed
+	if prog.NeedPyInit { // call PyInit if needed
 		ret.PyInit()
 	}
 
diff --git a/internal/llgen/llgenf.go b/internal/llgen/llgenf.go
index 64a06f55..e7f54dce 100644
--- a/internal/llgen/llgenf.go
+++ b/internal/llgen/llgenf.go
@@ -82,7 +82,7 @@ func GenFrom(fileOrPkg string) string {
 	ret, err := cl.NewPackage(prog, ssaPkg, pkg.Syntax)
 	check(err)
 
-	if prog.NeedPyInit() { // call PyInit if needed
+	if prog.NeedPyInit { // call PyInit if needed
 		ret.PyInit()
 	}
 
diff --git a/internal/runtime/llgo_autogen.lla b/internal/runtime/llgo_autogen.lla
index 1bb3e9d8..b7d0d6a2 100644
Binary files a/internal/runtime/llgo_autogen.lla and b/internal/runtime/llgo_autogen.lla differ
diff --git a/internal/runtime/z_string.go b/internal/runtime/z_string.go
index ee52e2c0..b137447d 100644
--- a/internal/runtime/z_string.go
+++ b/internal/runtime/z_string.go
@@ -45,16 +45,6 @@ func NewString(data unsafe.Pointer, len int) String {
 	return String{data, len}
 }
 
-// StringLen returns the length of a string.
-func StringLen(s String) int {
-	return s.len
-}
-
-// StringData returns the data pointer of a string.
-func StringData(s String) unsafe.Pointer {
-	return s.data
-}
-
 // StringCat concatenates two strings.
 func StringCat(a, b String) String {
 	n := a.len + b.len
diff --git a/py/bytes.go b/py/bytes.go
index cd6e257a..1b5277db 100644
--- a/py/bytes.go
+++ b/py/bytes.go
@@ -26,17 +26,17 @@ import (
 
 // String returns a new bytes object from a C string.
 //
-//go:linkname StringFrom C.PyBytes_FromString
-func StringFrom(s *c.Char) *Object
+//go:linkname FromCStr C.PyBytes_FromString
+func FromCStr(s *c.Char) *Object
+
+// FromString returns a new bytes object from a Go string.
+func FromString(s string) *Object {
+	return stringFromStringAndSize(c.GoStringData(s), uintptr(len(s)))
+}
 
 //go:linkname stringFromStringAndSize C.PyBytes_FromStringAndSize
 func stringFromStringAndSize(s *c.Char, size uintptr) *Object
 
-// String returns a new bytes object from a Go string.
-func String(s string) *Object {
-	return stringFromStringAndSize(c.GoStringData(s), uintptr(len(s)))
-}
-
 // CStr returns the content of a bytes object as a C string.
 //
 // llgo:link (*Object).CStr C.PyBytes_AsString
diff --git a/py/llgo_autogen.lla b/py/llgo_autogen.lla
index dd90aea6..79b52437 100644
Binary files a/py/llgo_autogen.lla and b/py/llgo_autogen.lla differ
diff --git a/ssa/decl.go b/ssa/decl.go
index bc6205ec..f5d1b02c 100644
--- a/ssa/decl.go
+++ b/ssa/decl.go
@@ -299,7 +299,7 @@ func (p Package) NewPyFunc(name string, sig *types.Signature, doInit bool) PyFun
 		return v
 	}
 	prog := p.Prog
-	prog.needPyInit = true
+	prog.NeedPyInit = true
 	obj := p.NewVar(name, prog.PyObjectPtrPtr().RawType(), InC)
 	if doInit {
 		obj.Init(prog.Null(obj.Type))
diff --git a/ssa/expr.go b/ssa/expr.go
index 72e478dd..6b174a91 100644
--- a/ssa/expr.go
+++ b/ssa/expr.go
@@ -598,6 +598,26 @@ func (b Builder) getField(x Expr, idx int) Expr {
 	return Expr{fld, tfld}
 }
 
+// StringData returns the data pointer of a string.
+func (b Builder) StringData(x Expr) Expr {
+	if debugInstr {
+		log.Printf("StringData %v\n", x.impl)
+	}
+	prog := b.Prog
+	ptr := llvm.CreateExtractValue(b.impl, x.impl, 0)
+	return Expr{ptr, prog.CStr()}
+}
+
+// StringLen returns the length of a string.
+func (b Builder) StringLen(x Expr) Expr {
+	if debugInstr {
+		log.Printf("StringLen %v\n", x.impl)
+	}
+	prog := b.Prog
+	ptr := llvm.CreateExtractValue(b.impl, x.impl, 1)
+	return Expr{ptr, prog.Int()}
+}
+
 // The IndexAddr instruction yields the address of the element at
 // index `idx` of collection `x`.  `idx` is an integer expression.
 //
@@ -649,8 +669,7 @@ func (b Builder) Index(x, idx Expr, addr func(Expr) Expr) Expr {
 			panic(fmt.Errorf("invalid operation: cannot index %v", t))
 		}
 		telem = prog.rawType(types.Typ[types.Byte])
-		pkg := b.Func.Pkg
-		ptr = b.InlineCall(pkg.rtFunc("StringData"), x)
+		ptr = b.StringData(x)
 	case *types.Array:
 		telem = prog.Index(x.Type)
 		if addr != nil {
@@ -717,7 +736,7 @@ func (b Builder) Slice(x, low, high, max Expr) (ret Expr) {
 			panic(fmt.Errorf("invalid operation: cannot slice %v", t))
 		}
 		if high.IsNil() {
-			high = b.InlineCall(pkg.rtFunc("StringLen"), x)
+			high = b.StringLen(x)
 		}
 		ret.Type = x.Type
 		ret.impl = b.InlineCall(pkg.rtFunc("NewStringSlice"), x, low, high).impl
@@ -871,7 +890,7 @@ func (b Builder) AllocaCStr(gostr Expr) (ret Expr) {
 		log.Printf("AllocaCStr %v\n", gostr.impl)
 	}
 	pkg := b.Func.Pkg
-	n := b.InlineCall(pkg.rtFunc("StringLen"), gostr)
+	n := b.StringLen(gostr)
 	n1 := b.BinOp(token.ADD, n, b.Prog.Val(1))
 	cstr := b.Alloca(n1)
 	return b.InlineCall(pkg.rtFunc("CStrCopy"), cstr, gostr)
@@ -1250,7 +1269,7 @@ func (b Builder) BuiltinCall(fn string, args ...Expr) (ret Expr) {
 				return b.InlineCall(b.Func.Pkg.rtFunc("SliceLen"), arg)
 			case *types.Basic:
 				if t.Kind() == types.String {
-					return b.InlineCall(b.Func.Pkg.rtFunc("StringLen"), arg)
+					return b.StringLen(arg)
 				}
 			}
 		}
diff --git a/ssa/package.go b/ssa/package.go
index bb976c89..e7694173 100644
--- a/ssa/package.go
+++ b/ssa/package.go
@@ -140,8 +140,8 @@ type aProgram struct {
 	callNoArgs *types.Signature
 	callOneArg *types.Signature
 
-	needRuntime bool
-	needPyInit  bool
+	NeedRuntime bool
+	NeedPyInit  bool
 }
 
 // A Program presents a program.
@@ -189,21 +189,11 @@ func (p Program) SetRuntime(runtime any) {
 	}
 }
 
-// NeedRuntime returns if the current package needs runtime.
-func (p Program) NeedRuntime() bool {
-	return p.needRuntime
-}
-
-// NeedPyInit returns if the current package needs Python initialization.
-func (p Program) NeedPyInit() bool {
-	return p.needPyInit
-}
-
 func (p Program) runtime() *types.Package {
 	if p.rt == nil {
 		p.rt = p.rtget()
 	}
-	p.needRuntime = true
+	p.NeedRuntime = true
 	return p.rt
 }
 
@@ -268,7 +258,7 @@ func (p Program) NewPackage(name, pkgPath string) Package {
 	stubs := make(map[string]Function)
 	pyfns := make(map[string]PyFunction)
 	pymods := make(map[string]Global)
-	p.needRuntime = false
+	p.NeedRuntime = false
 	// Don't need reset p.needPyInit here
 	// p.needPyInit = false
 	return &aPackage{mod, gbls, fns, stubs, pyfns, pymods, p}
@@ -397,7 +387,7 @@ func (p Package) rtFunc(fnName string) Expr {
 }
 
 func (p Package) pyFunc(fullName string, sig *types.Signature) Expr {
-	p.Prog.needPyInit = true
+	p.Prog.NeedPyInit = true
 	return p.NewFunc(fullName, sig, InC).Expr
 }
 
diff --git a/ssa/ssa_test.go b/ssa/ssa_test.go
index 2e05b4b5..1afddd0d 100644
--- a/ssa/ssa_test.go
+++ b/ssa/ssa_test.go
@@ -199,7 +199,7 @@ source_filename = "foo/bar"
 
 @a = external global {}
 `)
-	if prog.NeedRuntime() {
+	if prog.NeedRuntime {
 		t.Fatal("NeedRuntime?")
 	}
 }
diff --git a/x/sqlite/llgo_autogen.lla b/x/sqlite/llgo_autogen.lla
index e35d151b..cbd7267e 100644
Binary files a/x/sqlite/llgo_autogen.lla and b/x/sqlite/llgo_autogen.lla differ
diff --git a/x/sqlite/sqlite.ll b/x/sqlite/sqlite.ll
index c0e3dac3..2acb9d94 100644
--- a/x/sqlite/sqlite.ll
+++ b/x/sqlite/sqlite.ll
@@ -35,8 +35,8 @@ _llgo_0:
 define { ptr, i32 } @"(*github.com/goplus/llgo/x/sqlite.Sqlite3).Prepare"(ptr %0, %"github.com/goplus/llgo/internal/runtime.String" %1, ptr %2) {
 _llgo_0:
   %3 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
-  %4 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %1)
-  %5 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %1)
+  %4 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 0
+  %5 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 1
   %6 = trunc i64 %5 to i32
   %7 = call i32 @sqlite3_prepare(ptr %0, ptr %4, i32 %6, ptr %3, ptr %2)
   %8 = load ptr, ptr %3, align 8
@@ -48,8 +48,8 @@ _llgo_0:
 define { ptr, i32 } @"(*github.com/goplus/llgo/x/sqlite.Sqlite3).PrepareV2"(ptr %0, %"github.com/goplus/llgo/internal/runtime.String" %1, ptr %2) {
 _llgo_0:
   %3 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
-  %4 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %1)
-  %5 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %1)
+  %4 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 0
+  %5 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 1
   %6 = trunc i64 %5 to i32
   %7 = call i32 @sqlite3_prepare_v2(ptr %0, ptr %4, i32 %6, ptr %3, ptr %2)
   %8 = load ptr, ptr %3, align 8
@@ -61,8 +61,8 @@ _llgo_0:
 define { ptr, i32 } @"(*github.com/goplus/llgo/x/sqlite.Sqlite3).PrepareV3"(ptr %0, %"github.com/goplus/llgo/internal/runtime.String" %1, i32 %2, ptr %3) {
 _llgo_0:
   %4 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
-  %5 = call ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String" %1)
-  %6 = call i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String" %1)
+  %5 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 0
+  %6 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %1, 1
   %7 = trunc i64 %6 to i32
   %8 = call i32 @sqlite3_prepare_v3(ptr %0, ptr %5, i32 %7, i32 %2, ptr %4, ptr %3)
   %9 = load ptr, ptr %4, align 8
@@ -92,10 +92,6 @@ declare i32 @sqlite3_open(ptr, ptr)
 
 declare i32 @sqlite3_open_v2(ptr, ptr, i32, ptr)
 
-declare ptr @"github.com/goplus/llgo/internal/runtime.StringData"(%"github.com/goplus/llgo/internal/runtime.String")
-
-declare i64 @"github.com/goplus/llgo/internal/runtime.StringLen"(%"github.com/goplus/llgo/internal/runtime.String")
-
 declare i32 @sqlite3_prepare(ptr, i32, ptr, ptr)
 
 declare i32 @sqlite3_prepare_v2(ptr, i32, ptr, ptr)